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TRF7960A: TRF7960A in transmision mode for certification RED

Part Number: TRF7960A
Other Parts Discussed in Thread: TRF7960

Hello,

I designed a NFC Reader with TRF7960A. I must pass Test for Certification RED(radio equipment directive).

My question is : How can I configure TRF7960A in transmission mode. For Directive test I must to transmite continuously.

Regards

Franck

  • Hello Franck,

    To emit a continuous RF field, you would only need to set register 0x00 to have Bit 5 = 1, which turns the RF field on continuously. That usually is all that is needed for RF emission testing.

    If you need to transmit data to demonstrate the modulation and just a basic polling sequence isn't sufficient, then you should configure Register 0x09 Bits 0-2 for the modulation you need to demonstrate and then write a lot of data to the FIFO. In such a case you may need to craft a small while loop or other custom application code to send enough bytes continuously over RF, depending how long they need to see a data stream.

  • Thanks for your reply, 

    The sequence is :

    Enable TRF7960

    Configure CHIP_STATE_CONTROL register with 0x20 .

    It's all, there is not another register to configure? 

    it's possible to change the Power ?

  • Hello Franck,

    Just to get an RF field output, yes, that is all you would need.

    Power level can be changed between full and half-power with Bit 4 of Register 0x00. Beyond that, there is no real adjustments for output power of the RF field available. Other modifications concern the various modulation schemes offered by the device.